The O-Ring, cataloged under National Stock Number 5331-01-083-6403, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Isotta Fraschini Motori Spa. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-083-6403 |
| Primary Part Number | 79974F01 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Isotta Fraschini Motori Spa |
| Status | ACTIVE |
| Cross-Sectional Height | 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Center Hole Diameter | 0.858 INCHES MINIMUM AND 0.870 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROSILICONE CLASS FQ |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 79974F01 | Isotta Fraschini Motori Spa (ITA) |
| 1N141200013 | Wass Srl (ITA) |
| D3112420A | Isotta Fraschini Motori Spa (ITA) |
| Reference | Meaning |
|---|---|
| MIL-G-21569B AS568A-020 | 4/1 Identification reference U.S. Government activity |
| 2-020 | 5/9 Secondary reference M/a-Com Inc |
| 2-020 | 5/9 Secondary reference U.S. Government activity |
| 79974F01 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 5331-01-083-6403 is a O-Ring, manufactured by Isotta Fraschini Motori Spa, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-083-6403 has 3 manufacturer part numbers on file: 79974F01 (Isotta Fraschini Motori Spa), 1N141200013 (Wass Srl), D3112420A (Isotta Fraschini Motori Spa).
Key specifications for 79974F01: Cross-Sectional Height: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN; Center Hole Diameter: 0.858 INCHES MINIMUM AND 0.870 INCHES MAXIMUM IN; Material: RUBBER FLUOROSILICONE CLASS FQ. 3 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.